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Thread: CB750K no spark

  1. #1
    CB750 Member travis98146's Avatar
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    CB750K no spark

    Last month I posted about a 1981 CB750K with no spark. No one could tell how to check the spark units that showed signs of overheating (not even my dealership). I acquired a factory service manual that gave detailed test procedures for the entire ignition system. I now have spark from both coils and will add fuel and try for a start-up today.

  2. #2
    Forum Staff Travis's Avatar
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    So the coils tested good? How did the start-up go?
    - Travis

  3. #3
    CB750 Member travis98146's Avatar
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    CB750K no spark

    Quote Originally Posted by Travis View Post
    So the coils tested good? How did the start-up go?
    After adjusting spark plate and air gap, it tried to fire. Using starting fluid, it would fire all 4 cyls. I managed to get it running on #1 only. No fuel getting out of the other 3 carbs. Carb cleaning time. FYI, with the service manual, pulse generator, rectifier, CDI units, coils & plugs all checked out OK.

  4. #4
    wyliecoyote wyliecoyote's Avatar
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    Wow i think we need to do a basic check list of start up procedures for bikes that have sat 4 an extended period of time. Isnt that cleaning the carbs would be right near the top of that list. Anyway live and learn its all part of the fun!...Doug

  5. #5
    CB750 Member travis98146's Avatar
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    Houston, we have ignition! After a carb cleaning and a rebuild on the fuel shutoff valve, the 750 runs. Now it's time to re-do the timing and clean the vacuum fuel shutoff valve.

  6. #6
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  1. CB750K no spark
    By travis98146 in forum Electrical
    Replies: 4
    Last Post: 04-09-2012, 12:47 PM

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